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U Cambridge History and Philosophy of Science Dept:
Index
History of Science by Henry Smith Williams
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Rice U, The Galileo Project
U California, Berkeley
PhysicsWeb
by Ian Hutchinson,
MIT
RSC's chemical science network
with
Links, compiled by Carmen Giunta,
Le Moyne College Dept Chemistry
Umeå U
original text photocopies online
History of Science by Henry Smith Williams
by Joseph Needham
Smithsonian Institute
Virginia Tech
, by Bern Dibner; online book

History of Science by Henry Smith Williams
by Robert A. Morse
History of Technology,
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U Minnesota
by Charles Darwin: Book Downloads
History of Science by Henry Smith Williams
from
George Mason U
best websites for study & research:
Physical Sciences
review articles and tutorials in an encyclopædic format
History of Science by Henry Smith Williams
by Robert A. Morse
from
Rice U:
Science
old electronic glassware history and Physical Instruments
Museum,
Molecular Expression: Florida State U
by Thomas B. Greenslade, Jr. Professor Emeritus:
Electricity
Tutorial (comprehensive) by Thomas E. Jones
from
Microsoft Research:
Richard Feynman Lectures
(
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an Introduction (& full text) by
David E. Joyce,
Clark U
Glossary -
Links (Alexander Bogomolny
O'Connor & Robertson, U St Andrews, Scotland
Science, Technology, Arts
,
Truman State U,
Math & Computer Science Div
by Paul J. Gans, Dept Chemistry,
NYU,
Subject Index,
TimeLine
Course BS109: Introduction to Microbiology,
U Leicester
best websites for study & research

History of Science by Henry Smith Williams
by
Lars Bruzelius (
Bruzelius.info )
The Program in History of Science at
Princeton U: 
Overview and Lecture Index:
with demonstration videos

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Understanding the Laws of Energy, Martin Goldstein & Inge F. Goldstein
a Voyage Through Science to Solve Time's Greatest Mystery
James Prescott (1818-1889)
James Clerk (1831-1879)

(reversibility paradox) time reversal symmetry of fundamental physical laws contradicts the second law of thermodynamics